Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf56d731ad42c12c…

MALICIOUS

PDF

97.1 KB Created: 2021-09-23 17:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9070da8e2ffd472879b05b16090a1c4f SHA-1: f6243b9914db5e2cfa1cbddea0d1e5a171548f11 SHA-256: cf56d731ad42c12c663d2094561f06a593782ae8bac2efc10a507ca6e72eab26
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document's purpose is to trick the user into installing malicious software by posing as a necessary browser update or extension. While no scripts were directly extracted, the presence of numerous external URLs, many hosted on compromised or disposable domains, points to a distribution mechanism for further payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://vitalenzyme.com/uploads/fckupload/file/vofobodobusugudabulezaf.pdf In PDF document text
    • http://arenabilardo.com/data/_files/duzetowobagimuwikezidil.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/fc1b752b709e99dca56a37871bafb5a6/bejalururumejuwus.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/kimeraruravuxofu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/df91c46bbf48f8739e2101994df67736/1585909951.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/61767578288.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7a26da339---zemifujil.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/nekuziluki.pdfIn PDF document text
    • http://4bx.pl/public/file/99158109590.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/nijomawo.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/pirinavurofodifisumufud.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/takagoxuxezijezad.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/dukosibegasubalibul.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/48291819752.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/15864853341.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/miwideruzerofuka.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613e31abbe432---29172830338.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/dasapifelidujukogaxul.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/rebegojolisoru.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478b5fbfa51---28498897429.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/turevatizuweso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=which+are+the+assault+rifle+in+pubgPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C88 10872 bytes
SHA-256: bb5f55e64943d34f6294838afee5465e1be2062b09f56e9f9c09fef4fe93f4ee
font_02_sfnt_off00014566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14566 18792 bytes
SHA-256: 3297a7a8eba8352f8fe735316873bf5588e982c73e27f60bc5429bf8dc366460

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